A helicopter flies high above Yanqi Lake in Beijing on May 15, 2015. Thousands have applied for helicopter sightseeing via an app available on mobile devices from May 15. Helicopters at their service are Bell-429 worth 78 million yuan ($12.5 million) and Bell-407 worth 35 million yuan. Passengers, each covered with 3 million yuan insurance, will have to pay 1,999 yuan or 3,500 yuan - based on different types of helicopters - to get the experience, with free pick-up and delivery services. [Photo / IC]